links in videos ?

Hi folks,
I was just looking at this page:

http://www.techcrunch.com/2009/06/09/demo-firefox-35-treats-videos-like-web-pages-why-cant-flash-do-that/

It says there:

"links and other interactive elements can easily be placed inside videos."

I was wondering how this placement of links and other elements was
achieved. Is it something embedded in the ogg/theora stream, or is it
done at the html level ? If so how ?

Also, what do they mean by "other interactive elements" ?

It is certainly something which would be nice to build in to LiVES -
placing links and "other interactive elements" inside video right from
the editor would be very cool - also an advanced option of the
ogg/theora encoder could be to generate a web page embedding the video
file, which could then be uploaded to a server along with the video
file.

Cheers,
Salsaman.
http://lives.sourceforge.net